Spark-plug.



W. S. WITTER.

SPARK PLUG.

APPLICATION FILED JAN.6,1912

Patented Apr. 7, 191% E12,": LE".

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.lPetenied our. 3, 1914..

Application filed January 5. 25512. Serlel He. fillilfiifi.

'1 '0 all whom it may concern:

Be it known that l, Winners Smsur NIT- 'rns, ,a. citizen of the United States, residing at Toledo, in the county of Tome. and State of Iowa, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specificetion, reference being bad drawings.

This invention relates to spark plugs end more particularly to an attachment for providing s plurality of spark gaps in series with the main electrodes of e spsrlr plug.

The main object of this invention is to provide an attachment. for spark plugs which can be readily placed in position on the same without necessitating the removal or dismantling of any of the main parts oi this spark plug.

Another object. of this invention is to have this attachment arranged so that, it may be manufactured at e relatively low cost.

A further object of this invention is'to provide e suitable type of spark plug for the attachment in question.

Still another object of this invention is to arrange the snarl: plug and the attachment in question in such e manner as to permil; all necessary adjustment for the purpose in question, to be readily made.

Other objects of this invention will become apparent. as it is more fully set forth.

In the device referred to in this appliestion, means are provided whereby the some may be readily inserted in to a. spark plug arranged to receive it, and adjusted to suit the conditions arising. Further the device is arranged so that it may be moved in such a way as to provide other points to which the sparks may be jumped from the elec- Erodes in. question, should it be desirable to In the construction shown in the drawings, Figure 1 represents a view in elevetion of a spark plug embodying this invention. Fig. 2 is e. central sectional elevation of Fig. 1. Fig. 3 is a detail view of a, modifioetion. hereinafter specifically referred to.

Similar reference characters refer to similair parts throughout the drawings. a

In the construction shown in the drawings, 1 represents a contact nut used for fastening e. conductor against another nut 2, both oiwhich are threaded on a central condoms-l5. I

3 is a core made of any suitable insulatto the accompanying ing material which has its lower portion recessed as shown in Fig. 2, end is provided with an enlarged portion lei, in order thett may be held in position with res eci'r to the other parts usually used in r. spar (plug.

i gland nut 4 is disposed on the upper portion of the core. 3 and t-hreadably engages with e shell 5, whose lower portion extends underneath the enlarged portion 14 of the core, and suitsble washers or uclrings 13 are placed above and below tile enlurged portion 14 so that the gland nut 4 end the inwardly extending oortion of the shell can engage therewith. The lower portion 5 of the shell is exterior-1y threaded in order to permit the spark plug to be readily laced within s combustion engine or. the like in the usual manner, and the portion of the shell above the threaded portion is enlarged in the usual manner as is clearly shown in Figs. 1. end 2.

The cenirel primary electrode 15 hes its upper portion threaded as is clearly shown in Fig. Q, its lower portion enlarged as shown at 12, in order thee means may be provided for holding the conductor securely to the core A suitable contactmember 9 forms part of the conductor 15 and projects downwardly through the recessed portion of the core, and its lower portion. is hooked or bent as is cl'earlv shown in Fig. 2 in order to come adjacent L0 the inside surface of the intermeiliule electrode 8, which will be referred to in detail in e later part of the specification. The upper portion 11 of the electrode 8 is arranged to tlireaclably engage in the threaded recessed gortion of the core, so that it will be hell. securely thereby, end in a proper position in relation to the contact member in, and an electrode 10 which is secured to the shell.

it will be noticed by referringto the drawings, that the electrode 8 provides a means for giving s plurality of spark aps to the spark plug. between the shell on inshown in the drawings.

the spark gap. The general operation of the device is well known, so that no further descri 'tion will be made of the same.

T 1e lower portion of the core is provided with a collar orbea-d 7, which is clearly This bead serves for the purpose of strengthening the core at the portion where. the greatest heat strains are placed upon it, and also serves for the -These types of electrodial members are not shown or described in this application, but

purpose of supporting electrodial members.

reference is made to the main purpose for which the head 7 is indicated in order to more clearly indicate its use.

" In Fig. 3 a type of attachment is shown 'Lthreaded and a slot 16 is provi whicltis similar to that shown 'in Fig. 2. It is hollow, and its upper ortion 11 is ed longitudinally therein and its lower portion is flared.

7 Each one of these forms have special ad "vantages, but itcan be readily noted that their cost of manufacture is comparatively {small and that there is no diiiiculty in installing them in the spark plug in question,

that this may be done without disthe spark plug in any way. The

attachment shown in Fig. 3 can be readil turned in case it is beneficial to provide di ferent points to which the spark may he jumped from the electrodes 9 and 10. The threaded engagement of the parts permits a certain amount of vertical adjustment of the attachment, which will permit a relatively great amount of adjustment in the spark gaps 18 and 19.

Having thus described this invention,

what is claimed is A spark plug, comprising a shell, an insulating core mounted in said shell and formed at one end with a longitudinally disposed interiorl threaded socket, a tubular intermediate e ectrode formed with screw threads enga 'ng the screw threads of the socket,'.where y the said electrode may be turned and simultaneously moved into and out of the socket, an electrode secured to the shell and extending toward the edge, of the intermediate electrode, saidi intermediate electrode having such edge outwardly flared,

and a primary electrode secured in the core and extending down through and spaced .from the tubularintermediate electrode and formed with a contact point extending away. from the shell electrode and toward the flared edge of the intermediate electrode at a point opposite to the shell electrode.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

WILLIAM SIBERT WITTER;

Witnesses C. E. FLEMING, I Ron'r. RELOK. 

